archival/unzip.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini unzip implementation for busybox
   4  *
   5  * Copyright (C) 2004 by Ed Clark
   6  *
   7  * Loosely based on original busybox unzip applet by Laurence Anderson.
   8  * All options and features should work in this version.
   9  *
  10  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  11  */
  12 /* For reference see
  13  * http://www.pkware.com/company/standards/appnote/
  14  * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
  15  *
  16  * TODO
  17  * Zip64 + other methods
  18  */
  19
  20 //applet:IF_UNZIP(APPLET(unzip, BB_DIR_USR_BIN, BB_SUID_DROP))
  21 //kbuild:lib-$(CONFIG_UNZIP) += unzip.o
  22
  23 //usage:#define unzip_trivial_usage
  24 //usage:       "[-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]"
  25 //usage:#define unzip_full_usage "\n\n"
  26 //usage:       "Extract FILEs from ZIP archive\n"
  27 //usage:     "\n        -l      List contents (with -q for short form)"
  28 //usage:     "\n        -n      Never overwrite files (default: ask)"
  29 //usage:     "\n        -o      Overwrite"
  30 //usage:     "\n        -p      Print to stdout"
  31 //usage:     "\n        -q      Quiet"
  32 //usage:     "\n        -x FILE Exclude FILEs"
  33 //usage:     "\n        -d DIR  Extract into DIR"
  34
  35 #include "libbb.h"
  36 #include "bb_archive.h"
  37
  38 enum {
  39 #if BB_BIG_ENDIAN
  40         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  41         ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
  42         ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
  43         ZIP_DD_MAGIC         = 0x504b0708,
  44 #else
  45         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  46         ZIP_CDF_MAGIC        = 0x02014b50,
  47         ZIP_CDE_MAGIC        = 0x06054b50,
  48         ZIP_DD_MAGIC         = 0x08074b50,
  49 #endif
  50 };
  51
  52 #define ZIP_HEADER_LEN 26
  53
  54 typedef union {
  55         uint8_t raw[ZIP_HEADER_LEN];
  56         struct {
  57                 uint16_t version;               /* 0-1 */
  58                 uint16_t zip_flags;             /* 2-3 */
  59                 uint16_t method;                /* 4-5 */
  60                 uint16_t modtime;               /* 6-7 */
  61                 uint16_t moddate;               /* 8-9 */
  62                 uint32_t crc32 PACKED;          /* 10-13 */
  63                 uint32_t cmpsize PACKED;        /* 14-17 */
  64                 uint32_t ucmpsize PACKED;       /* 18-21 */
  65                 uint16_t filename_len;          /* 22-23 */
  66                 uint16_t extra_len;             /* 24-25 */
  67         } formatted PACKED;
  68 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
  69
  70 /* Check the offset of the last element, not the length.  This leniency
  71  * allows for poor packing, whereby the overall struct may be too long,
  72  * even though the elements are all in the right place.
  73  */
  74 struct BUG_zip_header_must_be_26_bytes {
  75         char BUG_zip_header_must_be_26_bytes[
  76                 offsetof(zip_header_t, formatted.extra_len) + 2
  77                         == ZIP_HEADER_LEN ? 1 : -1];
  78 };
  79
  80 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
  81         (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
  82         (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
  83         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  84         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  85         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  86         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  87         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  88         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  89         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
  90 } while (0)
  91
  92 #define CDF_HEADER_LEN 42
  93
  94 typedef union {
  95         uint8_t raw[CDF_HEADER_LEN];
  96         struct {
  97                 /* uint32_t signature; 50 4b 01 02 */
  98                 uint16_t version_made_by;       /* 0-1 */
  99                 uint16_t version_needed;        /* 2-3 */
 100                 uint16_t cdf_flags;             /* 4-5 */
 101                 uint16_t method;                /* 6-7 */
 102                 uint16_t mtime;                 /* 8-9 */
 103                 uint16_t mdate;                 /* 10-11 */
 104                 uint32_t crc32;                 /* 12-15 */
 105                 uint32_t cmpsize;               /* 16-19 */
 106                 uint32_t ucmpsize;              /* 20-23 */
 107                 uint16_t file_name_length;      /* 24-25 */
 108                 uint16_t extra_field_length;    /* 26-27 */
 109                 uint16_t file_comment_length;   /* 28-29 */
 110                 uint16_t disk_number_start;     /* 30-31 */
 111                 uint16_t internal_file_attributes; /* 32-33 */
 112                 uint32_t external_file_attributes PACKED; /* 34-37 */
 113                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 114         } formatted PACKED;
 115 } cdf_header_t;
 116
 117 struct BUG_cdf_header_must_be_42_bytes {
 118         char BUG_cdf_header_must_be_42_bytes[
 119                 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
 120                         == CDF_HEADER_LEN ? 1 : -1];
 121 };
 122
 123 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
 124         (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
 125         (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
 126         (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
 127         (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
 128         (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
 129         (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
 130         IF_DESKTOP( \
 131         (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
 132         (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
 133         ) \
 134 } while (0)
 135
 136 #define CDE_HEADER_LEN 16
 137
 138 typedef union {
 139         uint8_t raw[CDE_HEADER_LEN];
 140         struct {
 141                 /* uint32_t signature; 50 4b 05 06 */
 142                 uint16_t this_disk_no;
 143                 uint16_t disk_with_cdf_no;
 144                 uint16_t cdf_entries_on_this_disk;
 145                 uint16_t cdf_entries_total;
 146                 uint32_t cdf_size;
 147                 uint32_t cdf_offset;
 148                 /* uint16_t file_comment_length; */
 149                 /* .ZIP file comment (variable size) */
 150         } formatted PACKED;
 151 } cde_header_t;
 152
 153 struct BUG_cde_header_must_be_16_bytes {
 154         char BUG_cde_header_must_be_16_bytes[
 155                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 156 };
 157
 158 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 159         (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
 160 } while (0)
 161
 162 enum { zip_fd = 3 };
 163
 164
 165 #if ENABLE_DESKTOP
 166
 167 /* Seen in the wild:
 168  * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
 169  * where CDE was nearly 48 kbytes before EOF.
 170  * (Surprisingly, it also apparently has *another* CDE structure
 171  * closer to the end, with bogus cdf_offset).
 172  * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
 173  */
 174 #define PEEK_FROM_END (64*1024)
 175
 176 /* This value means that we failed to find CDF */
 177 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
 178
 179 /* NB: does not preserve file position! */
 180 static uint32_t find_cdf_offset(void)
 181 {
 182         cde_header_t cde_header;
 183         unsigned char *p;
 184         off_t end;
 185         unsigned char *buf = xzalloc(PEEK_FROM_END);
 186
 187         end = xlseek(zip_fd, 0, SEEK_END);
 188         end -= PEEK_FROM_END;
 189         if (end < 0)
 190                 end = 0;
 191         xlseek(zip_fd, end, SEEK_SET);
 192         full_read(zip_fd, buf, PEEK_FROM_END);
 193
 194         cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
 195         p = buf;
 196         while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
 197                 if (*p != 'P') {
 198                         p++;
 199                         continue;
 200                 }
 201                 if (*++p != 'K')
 202                         continue;
 203                 if (*++p != 5)
 204                         continue;
 205                 if (*++p != 6)
 206                         continue;
 207                 /* we found CDE! */
 208                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 209                 FIX_ENDIANNESS_CDE(cde_header);
 210                 /*
 211                  * I've seen .ZIP files with seemingly valid CDEs
 212                  * where cdf_offset points past EOF - ??
 213                  * Ignore such CDEs:
 214                  */
 215                 if (cde_header.formatted.cdf_offset < end + (p - buf))
 216                         break;
 217                 cde_header.formatted.cdf_offset = BAD_CDF_OFFSET;
 218         }
 219         free(buf);
 220         return cde_header.formatted.cdf_offset;
 221 };
 222
 223 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 224 {
 225         off_t org;
 226
 227         org = xlseek(zip_fd, 0, SEEK_CUR);
 228
 229         if (!cdf_offset)
 230                 cdf_offset = find_cdf_offset();
 231
 232         if (cdf_offset != BAD_CDF_OFFSET) {
 233                 xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
 234                 xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
 235                 FIX_ENDIANNESS_CDF(*cdf_ptr);
 236                 cdf_offset += 4 + CDF_HEADER_LEN
 237                         + cdf_ptr->formatted.file_name_length
 238                         + cdf_ptr->formatted.extra_field_length
 239                         + cdf_ptr->formatted.file_comment_length;
 240         }
 241
 242         xlseek(zip_fd, org, SEEK_SET);
 243         return cdf_offset;
 244 };
 245 #endif
 246
 247 static void unzip_skip(off_t skip)
 248 {
 249         if (skip != 0)
 250                 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 251                         bb_copyfd_exact_size(zip_fd, -1, skip);
 252 }
 253
 254 static void unzip_create_leading_dirs(const char *fn)
 255 {
 256         /* Create all leading directories */
 257         char *name = xstrdup(fn);
 258         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 259                 xfunc_die(); /* bb_make_directory is noisy */
 260         }
 261         free(name);
 262 }
 263
 264 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 265 {
 266         if (zip_header->formatted.method == 0) {
 267                 /* Method 0 - stored (not compressed) */
 268                 off_t size = zip_header->formatted.ucmpsize;
 269                 if (size)
 270                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 271         } else {
 272                 /* Method 8 - inflate */
 273                 transformer_aux_data_t aux;
 274                 init_transformer_aux_data(&aux);
 275                 aux.bytes_in = zip_header->formatted.cmpsize;
 276                 if (inflate_unzip(&aux, zip_fd, dst_fd) < 0)
 277                         bb_error_msg_and_die("inflate error");
 278                 /* Validate decompression - crc */
 279                 if (zip_header->formatted.crc32 != (aux.crc32 ^ 0xffffffffL)) {
 280                         bb_error_msg_and_die("crc error");
 281                 }
 282                 /* Validate decompression - size */
 283                 if (zip_header->formatted.ucmpsize != aux.bytes_out) {
 284                         /* Don't die. Who knows, maybe len calculation
 285                          * was botched somewhere. After all, crc matched! */
 286                         bb_error_msg("bad length");
 287                 }
 288         }
 289 }
 290
 291 static void my_fgets80(char *buf80)
 292 {
 293         fflush_all();
 294         if (!fgets(buf80, 80, stdin)) {
 295                 bb_perror_msg_and_die("can't read standard input");
 296         }
 297 }
 298
 299 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 300 int unzip_main(int argc, char **argv)
 301 {
 302         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 303
 304         zip_header_t zip_header;
 305         smallint quiet = 0;
 306         IF_NOT_DESKTOP(const) smallint verbose = 0;
 307         smallint listing = 0;
 308         smallint overwrite = O_PROMPT;
 309         smallint x_opt_seen;
 310 #if ENABLE_DESKTOP
 311         uint32_t cdf_offset;
 312 #endif
 313         unsigned long total_usize;
 314         unsigned long total_size;
 315         unsigned total_entries;
 316         int dst_fd = -1;
 317         char *src_fn = NULL;
 318         char *dst_fn = NULL;
 319         llist_t *zaccept = NULL;
 320         llist_t *zreject = NULL;
 321         char *base_dir = NULL;
 322         int i, opt;
 323         char key_buf[80]; /* must match size used by my_fgets80 */
 324         struct stat stat_buf;
 325
 326 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 327  *
 328  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 329  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 330  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 331  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 332  * --------  ------  ------- -----   ----   ----   ------    ----
 333  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 334  * --------          -------  ---                            -------
 335  *   204372            35278  83%                            1 file
 336  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 337  * Archive:  decompress_unlzma.i.zip
 338  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 339  * --------  ------  ------- -----   ----   ----   ------    ----
 340  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 341  * --------          -------  ---                            -------
 342  *   204372            35278  83%                            1 file
 343  * # unzip -v decompress_unlzma.i.zip
 344  * Archive:  decompress_unlzma.i.zip
 345  *   Length     Date   Time    Name
 346  *  --------    ----   ----    ----
 347  *    204372  09-06-09 14:23   decompress_unlzma.i
 348  *  --------                   -------
 349  *    204372                   1 files
 350  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 351  *    204372  09-06-09 14:23   decompress_unlzma.i
 352  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 353  *   Length     Date   Time    Name
 354  *  --------    ----   ----    ----
 355  *    204372  09-06-09 14:23   decompress_unlzma.i
 356  *  --------                   -------
 357  *    204372                   1 file
 358  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 359  * Archive:  decompress_unlzma.i.zip
 360  *   Length     Date   Time    Name
 361  *  --------    ----   ----    ----
 362  *    204372  09-06-09 14:23   decompress_unlzma.i
 363  *  --------                   -------
 364  *    204372                   1 file
 365  */
 366
 367         x_opt_seen = 0;
 368         /* '-' makes getopt return 1 for non-options */
 369         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 370                 switch (opt) {
 371                 case 'd':  /* Extract to base directory */
 372                         base_dir = optarg;
 373                         break;
 374
 375                 case 'l': /* List */
 376                         listing = 1;
 377                         break;
 378
 379                 case 'n': /* Never overwrite existing files */
 380                         overwrite = O_NEVER;
 381                         break;
 382
 383                 case 'o': /* Always overwrite existing files */
 384                         overwrite = O_ALWAYS;
 385                         break;
 386
 387                 case 'p': /* Extract files to stdout and fall through to set verbosity */
 388                         dst_fd = STDOUT_FILENO;
 389
 390                 case 'q': /* Be quiet */
 391                         quiet++;
 392                         break;
 393
 394                 case 'v': /* Verbose list */
 395                         IF_DESKTOP(verbose++;)
 396                         listing = 1;
 397                         break;
 398
 399                 case 'x':
 400                         x_opt_seen = 1;
 401                         break;
 402
 403                 case 1:
 404                         if (!src_fn) {
 405                                 /* The zip file */
 406                                 /* +5: space for ".zip" and NUL */
 407                                 src_fn = xmalloc(strlen(optarg) + 5);
 408                                 strcpy(src_fn, optarg);
 409                         } else if (!x_opt_seen) {
 410                                 /* Include files */
 411                                 llist_add_to(&zaccept, optarg);
 412                         } else {
 413                                 /* Exclude files */
 414                                 llist_add_to(&zreject, optarg);
 415                         }
 416                         break;
 417
 418                 default:
 419                         bb_show_usage();
 420                 }
 421         }
 422
 423 #ifndef __GLIBC__
 424         /*
 425          * This code is needed for non-GNU getopt
 426          * which doesn't understand "-" in option string.
 427          * The -x option won't work properly in this case:
 428          * "unzip a.zip q -x w e" will be interpreted as
 429          * "unzip a.zip q w e -x" = "unzip a.zip q w e"
 430          */
 431         argv += optind;
 432         if (argv[0]) {
 433                 /* +5: space for ".zip" and NUL */
 434                 src_fn = xmalloc(strlen(argv[0]) + 5);
 435                 strcpy(src_fn, argv[0]);
 436                 while (*++argv)
 437                         llist_add_to(&zaccept, *argv);
 438         }
 439 #endif
 440
 441         if (!src_fn) {
 442                 bb_show_usage();
 443         }
 444
 445         /* Open input file */
 446         if (LONE_DASH(src_fn)) {
 447                 xdup2(STDIN_FILENO, zip_fd);
 448                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 449                 if (overwrite == O_PROMPT)
 450                         overwrite = O_NEVER;
 451         } else {
 452                 static const char extn[][5] = { ".zip", ".ZIP" };
 453                 char *ext = src_fn + strlen(src_fn);
 454                 int src_fd;
 455
 456                 i = 0;
 457                 for (;;) {
 458                         src_fd = open(src_fn, O_RDONLY);
 459                         if (src_fd >= 0)
 460                                 break;
 461                         if (++i > 2) {
 462                                 *ext = '\0';
 463                                 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
 464                         }
 465                         strcpy(ext, extn[i - 1]);
 466                 }
 467                 xmove_fd(src_fd, zip_fd);
 468         }
 469
 470         /* Change dir if necessary */
 471         if (base_dir)
 472                 xchdir(base_dir);
 473
 474         if (quiet <= 1) { /* not -qq */
 475                 if (quiet == 0)
 476                         printf("Archive:  %s\n", src_fn);
 477                 if (listing) {
 478                         puts(verbose ?
 479                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 480                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 481                                 :
 482                                 "  Length     Date   Time    Name\n"
 483                                 " --------    ----   ----    ----"
 484                                 );
 485                 }
 486         }
 487
 488 /* Example of an archive with one 0-byte long file named 'z'
 489  * created by Zip 2.31 on Unix:
 490  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 491  *       sig........ vneed flags compr mtime mdate crc32>
 492  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 493  *      >..... csize...... usize...... fnlen exlen fn ex>
 494  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 495  *      >tra_field......................................
 496  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 497  *       ........... sig........ vmade vneed flags compr
 498  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 499  *       mtime mdate crc32...... csize...... usize......
 500  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 501  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 502  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 503  *      >..... fn extra_field...........................
 504  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 505  * 0080  34 00 00 00 00 00                               |4.....|
 506  */
 507         total_usize = 0;
 508         total_size = 0;
 509         total_entries = 0;
 510 #if ENABLE_DESKTOP
 511         cdf_offset = 0;
 512 #endif
 513         while (1) {
 514                 uint32_t magic;
 515                 mode_t dir_mode = 0777;
 516 #if ENABLE_DESKTOP
 517                 mode_t file_mode = 0666;
 518 #endif
 519
 520                 /* Check magic number */
 521                 xread(zip_fd, &magic, 4);
 522                 /* Central directory? It's at the end, so exit */
 523                 if (magic == ZIP_CDF_MAGIC)
 524                         break;
 525 #if ENABLE_DESKTOP
 526                 /* Data descriptor? It was a streaming file, go on */
 527                 if (magic == ZIP_DD_MAGIC) {
 528                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 529                         unzip_skip(3 * 4);
 530                         continue;
 531                 }
 532 #endif
 533                 if (magic != ZIP_FILEHEADER_MAGIC)
 534                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 535
 536                 /* Read the file header */
 537                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 538                 FIX_ENDIANNESS_ZIP(zip_header);
 539                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 540                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 541                 }
 542 #if !ENABLE_DESKTOP
 543                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 544                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 545                 }
 546 #else
 547                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 548                         /* 0x0001 - encrypted */
 549                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 550                 }
 551
 552                 if (cdf_offset != BAD_CDF_OFFSET) {
 553                         cdf_header_t cdf_header;
 554                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 555                         /*
 556                          * Note: cdf_offset can become BAD_CDF_OFFSET after the above call.
 557                          */
 558                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 559                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 560                                  * only from Central Directory. See unzip_doc.txt
 561                                  */
 562                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 563                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 564                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 565                         }
 566                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 567                                 /* This archive is created on Unix */
 568                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 569                         }
 570                 }
 571                 if (cdf_offset == BAD_CDF_OFFSET
 572                  && (zip_header.formatted.zip_flags & SWAP_LE16(0x0008))
 573                 ) {
 574                         /* If it's a streaming zip, we _require_ CDF */
 575                         bb_error_msg_and_die("can't find file table");
 576                 }
 577 #endif
 578
 579                 /* Read filename */
 580                 free(dst_fn);
 581                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 582                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 583
 584                 /* Skip extra header bytes */
 585                 unzip_skip(zip_header.formatted.extra_len);
 586
 587                 /* Filter zip entries */
 588                 if (find_list_entry(zreject, dst_fn)
 589                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 590                 ) { /* Skip entry */
 591                         i = 'n';
 592
 593                 } else { /* Extract entry */
 594                         if (listing) { /* List entry */
 595                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 596                                 if (!verbose) {
 597                                         //      "  Length     Date   Time    Name\n"
 598                                         //      " --------    ----   ----    ----"
 599                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 600                                                 (unsigned)zip_header.formatted.ucmpsize,
 601                                                 (dostime & 0x01e00000) >> 21,
 602                                                 (dostime & 0x001f0000) >> 16,
 603                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 604                                                 (dostime & 0x0000f800) >> 11,
 605                                                 (dostime & 0x000007e0) >> 5,
 606                                                 dst_fn);
 607                                         total_usize += zip_header.formatted.ucmpsize;
 608                                 } else {
 609                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 610                                         percents = percents * 100;
 611                                         if (zip_header.formatted.ucmpsize)
 612                                                 percents /= zip_header.formatted.ucmpsize;
 613                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 614                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 615                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 616                                                 (unsigned)zip_header.formatted.ucmpsize,
 617                                                 (unsigned)zip_header.formatted.cmpsize,
 618                                                 (unsigned)percents,
 619                                                 (dostime & 0x01e00000) >> 21,
 620                                                 (dostime & 0x001f0000) >> 16,
 621                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 622                                                 (dostime & 0x0000f800) >> 11,
 623                                                 (dostime & 0x000007e0) >> 5,
 624                                                 zip_header.formatted.crc32,
 625                                                 dst_fn);
 626                                         total_usize += zip_header.formatted.ucmpsize;
 627                                         total_size += zip_header.formatted.cmpsize;
 628                                 }
 629                                 i = 'n';
 630                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 631                                 i = -1;
 632                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 633                                 if (stat(dst_fn, &stat_buf) == -1) {
 634                                         if (errno != ENOENT) {
 635                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 636                                         }
 637                                         if (!quiet) {
 638                                                 printf("   creating: %s\n", dst_fn);
 639                                         }
 640                                         unzip_create_leading_dirs(dst_fn);
 641                                         if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
 642                                                 xfunc_die();
 643                                         }
 644                                 } else {
 645                                         if (!S_ISDIR(stat_buf.st_mode)) {
 646                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 647                                         }
 648                                 }
 649                                 i = 'n';
 650
 651                         } else {  /* Extract file */
 652  check_file:
 653                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 654                                         if (errno != ENOENT) {
 655                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 656                                         }
 657                                         i = 'y';
 658                                 } else { /* File already exists */
 659                                         if (overwrite == O_NEVER) {
 660                                                 i = 'n';
 661                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 662                                                 if (overwrite == O_ALWAYS) {
 663                                                         i = 'y';
 664                                                 } else {
 665                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 666                                                         my_fgets80(key_buf);
 667                                                         i = key_buf[0];
 668                                                 }
 669                                         } else { /* File is not regular file */
 670                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 671                                         }
 672                                 }
 673                         }
 674                 }
 675
 676                 switch (i) {
 677                 case 'A':
 678                         overwrite = O_ALWAYS;
 679                 case 'y': /* Open file and fall into unzip */
 680                         unzip_create_leading_dirs(dst_fn);
 681 #if ENABLE_DESKTOP
 682                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 683 #else
 684                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 685 #endif
 686                 case -1: /* Unzip */
 687                         if (!quiet) {
 688                                 printf("  inflating: %s\n", dst_fn);
 689                         }
 690                         unzip_extract(&zip_header, dst_fd);
 691                         if (dst_fd != STDOUT_FILENO) {
 692                                 /* closing STDOUT is potentially bad for future business */
 693                                 close(dst_fd);
 694                         }
 695                         break;
 696
 697                 case 'N':
 698                         overwrite = O_NEVER;
 699                 case 'n':
 700                         /* Skip entry data */
 701                         unzip_skip(zip_header.formatted.cmpsize);
 702                         break;
 703
 704                 case 'r':
 705                         /* Prompt for new name */
 706                         printf("new name: ");
 707                         my_fgets80(key_buf);
 708                         free(dst_fn);
 709                         dst_fn = xstrdup(key_buf);
 710                         chomp(dst_fn);
 711                         goto check_file;
 712
 713                 default:
 714                         printf("error: invalid response [%c]\n", (char)i);
 715                         goto check_file;
 716                 }
 717
 718                 total_entries++;
 719         }
 720
 721         if (listing && quiet <= 1) {
 722                 if (!verbose) {
 723                         //      "  Length     Date   Time    Name\n"
 724                         //      " --------    ----   ----    ----"
 725                         printf( " --------                   -------\n"
 726                                 "%9lu"   "                   %u files\n",
 727                                 total_usize, total_entries);
 728                 } else {
 729                         unsigned long percents = total_usize - total_size;
 730                         percents = percents * 100;
 731                         if (total_usize)
 732                                 percents /= total_usize;
 733                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 734                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 735                         printf( "--------          -------  ---                            -------\n"
 736                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 737                                 total_usize, total_size, (unsigned)percents,
 738                                 total_entries);
 739                 }
 740         }
 741
 742         return 0;
 743 }